diff --git a/oga.gemspec b/oga.gemspec
index 520870b..fe765ca 100644
--- a/oga.gemspec
+++ b/oga.gemspec
@@ -41,6 +41,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'yard'
   s.add_development_dependency 'simplecov'
   s.add_development_dependency 'kramdown'
-  s.add_development_dependency 'benchmark-ips'
+  s.add_development_dependency 'benchmark-ips', ['~> 2.0']
   s.add_development_dependency 'rake-compiler'
 end